On the night of October 4, 1967, at about 11:20 p.m. Atlantic Daylight Time, it was reported that something (later referred to as a UFO) had crashed into the waters near Shag Harbour, on Nova Scotia's South Shore. At least eleven people saw a low-flying lit object head down towards the harbour. Multiple witnesses reported hearing a whistling sound "like a bomb", then a "whoosh", and finally a loud bang. Some reported a flash of light as the object entered the water. Thinking that an airliner or smaller aircraft had crashed into the Sound next to Shag Harbour , some witnesses reported the event to the local Royal Canadian Mounted Police RCMP detachment.
The unknown object was referred to as a "UFO" in official Canadian government documents. A Canadian Naval recovery effort immediately followed, perhaps aided in part by the U.S. military. The event is sometimes compared to the Roswell UFO incident and Kecksburg UFO incident, two other events alleged to be military crash-recoveries of UFOs.